跨域錯誤提示：

XMLHttpRequest cannot load http://xxx.com. Request header field Content-Type is not allowed by Access-Control-Allow-Headers.

解決方案：

例如php服務端程序設置頭：

header('Access-Control-Allow-Origin: *'); header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept"); header('Access-Control-Allow-Methods: GET, POST, PUT,DELETE');

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